The History of Grep - Old school stuff
Potentially interesting:
Prof. Brian Kernighan talks about how grep came into existence.
Interesting indeed.

I always assumed that grep somehow "evolved" at a rather slow pace: I thought that people were using "g/re/p" in ed all the time, so they eventually felt the need to simplify that task and wrote grep.

But no, of course, it just happened over night. :-)

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